由兩個(gè)獨(dú)立線(xiàn)圈(開(kāi)和關(guān))進(jìn)行控制。即使繼電器失去電源，這些接點(diǎn)仍能保持其位置。繼電器能夠識(shí)別所有閉鎖輸出接點(diǎn)卡，并組裝相應(yīng)的設(shè)置菜單。有電源時(shí)，在執(zhí)行繼電器其他功能前，繼電器首先從硬件讀出閉鎖接點(diǎn)的位置(如保護(hù)和控制功能塊或靈活邏輯)。

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